An admitted blunder by pinch-hitter Brady Clark ran the Mets right out of a potential rally yesterday.

With the Mets down by two runs to the Brewers and nobody out in the eighth against vulnerable ex-teammate Guillermo Mota, Clark was thrown out at home to complete a momentum-killing double play in the 9-7 loss.

The little-used Clark realized he should have stayed at third on Luis Castillo’s routine ground ball to Prince Fielder but said he followed his instincts upon hearing the crack of the bat.

“I screwed it up,” Clark said after the Mets ended up stranding three runners without scoring in that inning. “My instincts told me to go, and by the time I thought better of it, it was too late.”

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Despite describing his ailing left hamstring as “a little better,” Jose Reyes remains unsure about rejoining the lineup tomorrow for a three-game home series with the Nationals.

The Mets’ All-Star shortstop will be re-evaluated today after missing his second consecutive game yesterday with hamstring soreness he aggravated while running out a ball in Friday’s win over the Brewers. Reyes was replaced at short once again by Damion Easley.

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David Wright, who is set to appear on “The Late Show with David Letterman” tonight, hit his 100th career home run in the first inning.

It was Wright’s second homer in as many at-bats against the Brewers after his eighth-inning solo shot Saturday off Ben Sheets. But that proved to be the extent of the highlights for Wright, who left five runners on base and made another poor throw wide of first on a ground ball in the seventh.

Wright has been plagued by throwing problems all season.

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Duaner Sanchez is set to rejoin the Mets’ bullpen sometime this week after pitching one scoreless inning in consecutive games for Triple-A New Orleans over the weekend.

It marked the first back-to-back appearances for Sanchez since wrecking his right shoulder in a July 2006 taxi accident. Bringing Sanchez off the DL means the Mets will have to create a roster spot, most likely by sending reliever Carlos Muniz back to New Orleans.

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Manager Willie Randolph said Matt Wise also is expected back in the bullpen this week after missing the past nine games with a bruised right forearm…. Every Met will wear jersey No. 42 tomorrow against the Nationals in honor of Jackie Robinson. Tomorrow is the 61st anniversary of Robinson breaking baseball’s color barrier with the Brooklyn Dodgers.